What is 0.85 as a fraction?

0.85 as a fraction is 17/20. Write the digits over 100 to get 85/100, then divide top and bottom by 5.

What is 0.85 as a percentage?

0.85 is 85%. Multiplying a decimal by 100 moves the point two places to the right.

How many millimetres is 0.85 of an inch?

0.85 inches is 21.59 mm, using the exact definition 1 inch = 25.4 mm.

0.85 as a fraction

Fraction17/20lowest terms

Decimal0.85

Percent85%

How to get there

0.85 has 2 digits after the point, so it is that many hundredths: write the digits over 100 — 85/100.
85 and 100 share a greatest common divisor of 5. Divide both by it: 17/20.

85 of 100 squares — 0.85 of the whole, which is also 85%.

As a measurement

Read as inches, 0.85″ is 21.59 mm exactly. The nearest marks on a rule:

Rule	Nearest mark	Inches	mm	Difference
16ths	7/8″	0.875	22.225	+0.635 mm
32ths	27/32″	0.84375	21.4313	−0.1588 mm
64ths	27/32″	0.84375	21.4313	−0.1588 mm

Common questions

What is 0.85 as a fraction?: 0.85 as a fraction is 17/20. Write the digits over 100 to get 85/100, then divide top and bottom by 5.
What is 0.85 as a percentage?: 0.85 is 85%. Multiplying a decimal by 100 moves the point two places to the right.
How many millimetres is 0.85 of an inch?: 0.85 inches is 21.59 mm, using the exact definition 1 inch = 25.4 mm.

The same number, other ways

17/20Everything about the fraction: equivalents, the bar model, the number line.85%The same value as a percentage, with its own derivation.Decimal → fraction chartThe whole lookup table, printable.Nearest fractionMatch 0.85″ against any rule, with the exact error.

Where this comes from. Exact rational arithmetic on the values shown — fractions are pairs of integers until display, and inch–metric conversion uses 25.4 mm to the inch, exact by definition since 1959. See the full methodology.